2004 Cadillac DeVille Owner's Manual - Page 92

Engine Coolant Heater Your vehicle may be equipped with an engine coolant heater. In very cold weather, 0°F (−18°C) or colder, the engine coolant heater can help. You will get easier starting and better fuel economy during engine warm-up. Usually, the coolant heater should be plugged in a minimum of four hours prior to starting your vehicle. At temperatures above 32°F (0°C), use of the coolant heater is not required. To Use the Engine Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord. The electrical cord is located on the driver's side of the engine, behind the transaxle dipstick/fluid fill location (C) and next to the engine. 3. Plug it into a normal, grounded 110-volt AC outlet. A. Engine Oil Dipstick Location B. Engine Coolant Heater Cord C. Transaxle Dipstick/Fluid Fill Location 2-28